So am I reading this correctly??? There is NO more Transmission tune available? I just looked on their website and it still shows as an option to purchase for $250
Green Diesel Engineering
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That sounds exactly like something the government would do, wasting money chasing the small fish when you could catch one big one and go home for the day. Typical
So a couple weeks have passed and I've got a few thousand miles under the belt thanks to an emergency trip to Denver. On the way out to Denver I was towing a car on a U-Haul auto transport, ~6500lbs on the car carrier with just about a max payload in the truck after tongue weight. On the way back it was just me and the family so a normal long haul road trip.
First my impressions: This is a pretty fun tune.
First my impressions: This is a pretty fun tune.
- Noticeably more get up and go, though I haven't got a dyno to test it on.
- Torque filtering is gone. Peddle go down --> truck go forward, no more persistent 1-2 second delays
- Trans temps are way down, even while towing. Before my tune I usually held 190 F in my trans temp on the highway in the summer, on the trip back 175 was the temp of the day. Towing trans temps were also significantly reduced. Towing before I could see temps as high as 230 average mid 220's, but with the tune I never topped 215. It usually held about 206-208. Trans temp control is good enough I will probably scrap my plan to add an extra trans cooler.
- My truck definitely had an off the starting line shudder about 50-70% of the time before the tune. After the tune it happens rarely. It's intermittent enough that I'm not sure if it's the shudder or just aggressively painted lines on the road way and hitting them just right. Intentionally reproducing my shudder has become impossible and it is much more infrequent. Hopefully this will let me get more life out of the torque converter. My trans shop will probably be mad at GDE.
- She's got a bit more rumble to her now that the engine lugs more often. I personally like the sound, but if you want to hear engine's scream constantly you'll want to look else where.
- The shifting pattern feels much more like a manual rather than trying to feel like a CVT. You can definitely feel when the gears change due to the shift happening earlier and thus the engine needing to catch up right after the gear shift. This doesn't bother me, but it might bother you.
- My towing MPG was better than the last time I pulled a similar set up. Nov last year I moved 5,500 lbs via u-haul auto transport to Denver and averaged about 15 MPG on the way there, this trip was heavier (6500 lbs) and I averaged 17.5.
- Highway MPG are slightly higher, IIRC last Nov's return trip scored 30.4 MPG and this trip scored 31.8.
- Note: all MPG numbers are based on the DIC. I did not do pump math because I was using different pumps and filling at various levels to make sure I didn't run out and didn't waste time when I was already stopped for things like bathroom or lunch.
- Towing up steep inclines (6-7%) on I-24 in TN I did not have any issues holding 65 MPH or accelerating after getting cut off. I did have to slow down and move right because of lane restrictions (I had more than 3 axles) but not due to lack of power or falling behind.
- Around town MPG isn't fair to compare thanks to the Rona. My daily driving from before COVID is very different from my current driving so I can't fairly compare them. Maybe when things settle down and I get back to driving to the office I can compare in town mileage. (no I haven't bothered to keep track of in town mileage since March because I knew it'd be terrible. Can't get any efficiency going to the store once or twice a week)
- The turbo definitely kicks on more often. This one doesn't bother me but if you hate the turbo sounds you might need to consider another option.
- I hit an off road trail today and I honestly couldn't tell a difference. Had as much fun as always, truck had all the power and torque it needed to. I'm not sure if I should have felt a difference, but I also only shoot for moderate trails. I don't have a ZR2 and it is my daily driver. Snapping an axle or anything like that would be a real problem for me so I avoid anything extreme.
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